ABS (Anti-Lock Brake System)
DESCRIPTIONThe Anti-Lock Brake System (ABS) controls the hydraulic brake pressure of all four wheels during braking on hazardous road surfaces, preventing the wheels from locking up. ABS provides the following benefits.
1. Enables steering around obstacles with a greater degree of certainty, even during emergency braking.
2. Enables stopping during emergency braking while keeping stability and steerability even on curves.
If a malfunction occurs, a diagnosis function and fail-safe system are included for serviceability.
The Hydraulic and Electronic Control Unit (HECU) receives signals about the vehicle's speed, direction and road conditions from sensors at the wheels.
Based on these signals, the control unit will determine the optimum amount of wheel spin.
1. ABS warning lamp module
The active ABS warning lamp module indicates the operating condition of the ABS.
The ABS warning lamp is turned on under the following conditions.
- During the initialization phase after ignition switch ON (3 seconds).
- In the event of inhibition of ABS functions by failure.
- When the system ECU is shut down even though ignition power is applied.
- During diagnostic mode.
2. EBD warning lamp module
The active EBD warning lamp module indicates the operating condition of the EBD. However, in case the parking brake switch is turned on, the EBD warning lamp is always turned on regardless of EBD functions.
The EBD warning lamp is turned on under the following conditions.
- During the initialization phase after ignition switch ON. (3 seconds).
- When the system ECU is shut down even though ignition power is applied.
- When the parking brake switch is ON or brake fluid is low level.
- In the event of inhibition of EBD function.
3. TCS warning lamp module the passive TCS warning lamp module indicates the operating condition of the TCS.
The TCS warning lamp is turned on under the following conditions:
- During the initialization phase after ignition switch ON (3 seconds).
- In the event of inhibition of TCS functions by failure.
- During diagnostic mode.
4. TCS function lamp module
The TCS function lamp indicates the operating condition of TCS function.
The TCS function lamp is on under the following condition:
- During the initialization phase (3 seconds). The TCS function lamp is blinking under the following conditions.
- During TCS control.
SAFETY CONCEPT
1. ABS
When any failures are occurred in the ABS system, the ABS ECU turns on the warning lamps and inhibits the control corresponding that as follows.
2. TCS
When any failures are occurred in the TCS system, the TCS ECU turns on the warning lamps and inhibits the control corresponding that as follows.
